We need to see what file was modified, and it'd be great if we knew what "something" was that you installed. You can use Secrets.prefpane to show hidden files in Finder, then open up ~/.bash_profile, or .profile, or .bashrc, or what have you in your favorite text editor, then copy/paste into here.
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Jason SalazApr 1 '11 at 21:45

1 Answer
1

Sounds like it's screwing up your PATH, so the shell can't find any of the usual commands. In this case, you can still use the commands by specifying their entire path (e.g. /bin/ls instead of just `ls), or just reset your PATH manually: